The Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver delivers a refined, duty-grade AR-15 upper built around a 13.7" cold hammer forged, chrome-lined barrel with a 1:7 twist and dimpled heavy profile. Paired with a free-floated M-LOK handguard and a forged 7075-T6 aluminum upper receiver, this kit is engineered for consistent accuracy, smooth cycling, and long service life on any quality AR-15 lower.

This upper is chambered in 5.56 NATO and optimized for reliability, including an advanced low-back-pressure gas system that works especially well when a suppressor is added. The extended handguard offers generous space for lights, grips, and other accessories, making it a strong choice for range work, training, or general-purpose carbine builds. Knights Armament’s attention to detail and proven craftsmanship are evident in every component of the SR-15 KS-1 upper.

Key Features:

• Manufacturer: Knights Armament
• Model: SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver
• Caliber: 5.56 NATO
• Barrel Length: 13.7"
• Twist Rate: 1:7
• Receiver Material: 7075 Aluminum
• Finish Color: Black
• Handguard: Free-Float M-LOK
• Gas System: Low-Back-Pressure Design
• Weight: 70.4 oz
• Length: 23.7"